The birds of North AmericaNew York :Published under the auspices of the Natural Science Association of America,1903. biodiversitylibrary.org/page/35159679Aquila chrysaetos use 9 different calls 2 communicate esp. when their young & food are involved! biodiversitylibrary.org/page/35159679 #bhlpod > thx @eol
Today's #bhlpod features a pg of hummingbird spp. from Biologia Centrali-Americana biodiversitylibrary.org/page/572766. What R the current names 4 these?
The birds of Australia, supplement /.London :Printed by Taylor and Francis ... published by the author ...,[1851]-1869..biodiversitylibrary.org/page/48517496